C++ 2D Arrays

What is a 2D Array in C++?

A 2D array in C++ is like a table or grid — rows and columns of values. 📊

Imagine a 3×3 tic-tac-toe board. That’s a 2D array in action!

🧱 Syntax of a 2D Array

type arrayName[rows][columns];

For example:

int matrix[2][3];           // 2 rows, 3 columns
int table[2][2] = {{1, 2}, {3, 4}};  // Initialization

🔧 Example: Basic 2D Array

#include <iostream>
using namespace std;

int main() {
    int matrix[2][3] = {
        {1, 2, 3},
        {4, 5, 6}
    };

    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            cout << matrix[i][j] << " ";
        }
        cout << endl;
    }

    return 0;
}

Try It Now

🧠 Accessing Elements

You can access any element using array[row][column]. For example, matrix[1][2] gives you 6.

🛠 Modify 2D Array Values

Just like 1D arrays, use the index to update values:

matrix[0][1] = 10;

💡 Summary

  • A 2D array is a grid of values—rows and columns
  • Use array[row][col] to access or change elements
  • Great for tables, games, and matrix-style data

Now you can store data in a grid like a pro! 🧮